Insecticide



- ratentedau 11,, 1925 7 umrr.o s'ra'r'as RUBIG C. ROABK, ,OF BALTIMORE, MARYLAND, A'SSIGNOR 130' GENERAL CHEMICAL COMPANY, OF NEW YORK, N. Y.,

FATE oFFics.

a CORPORATION or NEW xonx.

INSEGTICIDE.

Ho Drawing.

To all whom it may concern: Be it known that I, RURIG C. ROARK, a citizen of the United States, residing atthe Jc'ity and county I of Baltimore, State of l5 Maryland, have invented certain new'and useful Improvements in Insecticides, of which the following is a specification.

' ,My invention relates to a composition of matter suitable for roducin'g, u on admix- -1 ture with water, barium tet'rasul d which is a spray material adapted for the spraying iof'fruittrees, shade trees, shrubs, truck- "crops and otherdor similar plants for the purpose of killing injurious insects, mites,

1 fungous rowth or similar infesting growth or 'growt s, or of preventing or mitigating conditions produced by them or any of them. My invention is based upon the discovery 2 am barium sulfid and sulfur, when mixed,

form a substantially stable product which.

4;; sulfur goes into solution than called for by the formation of bariumtetrasulfid and any further. excess of sulfur is easily kept in suspension-- and formsjin itself-an excellent fungicide. For commercial purposes, how

portions with what is known in' the barium industry as black ash, and which is a prod not containing barium sulfid, barium carbonate, carbon andother materials, usually made from barium sulfate and carbonaceous material.

Thus, when using barium sulfid'alone I may employ about 100 parts of this material to approximately 57 parts of sulfur. When 60 using black ash containing (for. example) 6.0% of barium sulfid I may employ pou nds of this substance to about 34 ounds ief-sulfur. As already explained. may, howerer; for "purposes add in either Application filed use. as, 1922. Serial No. 546,159.

case an excess of sulfur; for instance I may add 100 parts of such black ash to 100 parts of sulfur. For commercial purposes I am no w -using 65 pounds" of black ash, contaming. approximately 60% of BaS, with 35 pounds of finely divided sulfur.

To the mixture described above I add a suitable amount of water, preferably cold, to be used as a spray. (for instance from 1 pounds to 50 gallons of water to 14 pounds of the above described commercial mixture) One advantage of employingmy invention is that the barium sulfid and sulfur are not processed in any manner in the factory but are shipped as a simple mixture. The mixture, as already explained, I have discovered to be substantially stable, much more stable 1 than barium tetrasulfid. The mixture may readilybe dissolved by the user in cold water and need not be dissolved in hot water." There is practically no loss dueeto caking or other changes during shipment or storage.

The time of solution is much shorter, .in

many cases 20% less, than the time needed for dissolving the large, or commercial form,

of barium tetrasulfid crystals. 1

When employing barium sulfid of black ash the further advantage is ob tained" that the spray made-from my composition leaves a marked gray color on the plant which acts as a better marker, that is 'to say, indicates better than the dissolved barium tetrasulfid cr stals, just what por- 'tion of theplant has b v I desire it to be distinctly understood that I do notclaim in my claims anything'that een sprayed.

is disclosed in UnitedStates Letters Patent No. 1,263,856.;issued April 23, 1918, upon an invention-of Cyril Backus Clark which de- 40 over, I preferto mix sulfur-in suitable proiscribes a method ofmanufacturing barium tetrasulfid-and various methods of using barium tetrasulfid as an insecticide.

.Iclaim: y 1. The process of making barium tetrasulfid which comprises mixing barium-sulfid 3. The improvement in" the art of applying barium tetrasulfid to plants which com- 8D in' the form prises mixing barium sulfid and sulfur in a suitable proportion of cold water and spraying the resulting solution upon a plant.

.4. The improvement in the art of applying poly-sulfids containing four atoms of sulfur or more to plants which comprises mixing barium sulfid with an amount of sulfur substantially greater than when necessary to produce barium tetrasulfid adding a suitable quantity of cold water to the mixture and spraying the resulting solution.

5. The process of making barium tetrasulfid which comprises mixing black ash and sulfur in cold Water.

mixing black ash Wlth an amount of sulfur water to form an insecticide, comprising a mixture of black ash and sulfur, the amount of sulfur being substantially in excess of the amount needed to convert the barium sulfid content of the black ash into barium tetrasulfid substantially as and for t the purpose described.

10. A composition of matter for use, with water, to form an insecticide, com rising a stantially as and for the purpose described.

In testimony whereof I have hereunto set my hand.

RURIG C. ROARK.

0 mixture of barium sulfid and su fur sub- I 

